Swimming pools inside and out have no indication as to when they can open, but I do think lidos should be allowed my reasons are:
The pools are chlorinated which kills the virus.
With the warm weather people are turning to wild swimming, every year they run scaremongering campaigns about how unsafe this is when they should be running campaigns of how to stay safe (cold water shock awareness, don’t drink alcohol etc) this year, nothing, there have already been deaths from people unaware of the risks.
It’s no different to the sunbathing in parks rule to social distance
It wouldn’t be too hard to implement a cleaning regime of toilets and changing rooms
Most lidos have been rescued by enthusiasts and loosing an entire season income will be devastating
And from a personal point of view I went to my wild swim spot that has always been empty and it was heaving, so I couldn’t swim.